1935 Cadillac - GM Heritage Center

101
ENGINE
5. Worn Limits for Cylinder Block
When ordering first or second oversize cylinder
blocks from the factory, care should be exercised
in determining the amount of wear on the blocks
returned for exchange as this wear on the replaced
blocks should determine the size of blocks to
order.
If the standard size cylinder blocks show less
than .012 in. wear or out-of-round they may be
returned in exchange for first oversize blocks.
If the wear exceeds .012 in. but is less than .027 in.,
second oversize blocks should be ordered for
installation on the car.
6. Piston Clearance (See Plate 42)
Two feeler ribbons of different thickness should
be used for fitting anodized aluminum pistons.
These ribbons should be from %-inch to J^-inch
wide, and, for convenience, from 8 to 10 inches
long. The thickness for the various series should
be as follows:
Thin Thick
Car Series No. Gauge Gauge
Cadillac V-8 002 in. .0025 in.
LaSalle, Cad. V-12, V-16.. .0015 in. .002 in.
The feeler ribbon, the piston and the cylinder
wall should be clean and the ribbon must be
free from kinks and wrinkles when fitting the
pistons.
The ribbon should be exactly in line with the
center of the thrust face during the fitting process
and on the side opposite the vertical slot in the
piston skirt. With the feeler in place in the
cylinder and the piston in its running position, the
piston should drop of its own weight with the thin
feeler and hold tightly in place with the thick
feeler.
For convenience the fit trials may be made with
the upper end of the piston just sufficiently above
the top of the cylinder to hold it with the fingers.
Pistons for the LaSalle 350 are furnished in
five sizes under the following part numbers:
Part No.
Size
1096295.. Standard
1098567 003 in. oversize
1098563 005 in. oversize
1096325 015 in. oversize
1096327 030 in. oversize
IMPORTANT: Before ordering pistons for
replacement, it is extremely important that the
size of the cylinder bores be determined by actual
measurement. This is essential because the cylinder
bore may have been increased by refinishing
and there is no identification to indicate the size
other than by measuring at the time of replacement.
This is the only way to be sure of avoiding
error in ordering.
Oversize V-8, V-12 and V-16 cylinder blocks
will be supplied on an exchange basis.
7. Removing and Installing Piston Pins
To remove a piston pin from the aluminum
alloy pistons, first place the piston in boiling
water to expand the piston pin hole, and then
push the pin out by hand from the smaller side
(the locking screw side) toward the larger side,
opposite the locking screw. See Fig. 33, Plate 42.
An arbor press should never be used under any
circumstances to remove the piston pin. This
procedure would seriously distort or crack the
piston.
When installing a piston pin, the pin should be
lubricated with engine oil and installed with a
light hand push fit in the side opposite the locking
screw with the piston heated to a temperature of
about 70°F. The piston pin should also be a light
hand push fit in the locking screw side of the piston
but with the piston heated to a temperature of
about 200 to 210° F.
8. Removing and Installing Piston Pin
Bushings
The removal and installation of the split-type
piston pin bushings requires the use of special
tools. A kit of tools (Tool No. HMJ-250) is
furnished for this purpose.
The bushing should be removed in an arbor
press and should be started by giving the handle
of the press a sudden jerk instead of a steady
pull. After the bushing is started it will move out
quite freely. The connecting rod should then be
thoroughly cleaned of all chips and dirt.
The bushing cannot be pressed into the connecting
rod in the usual manner. Instead, it is
pressed in the rod and expanded with an expanding
bar to press the bronze into very close contact
with the steel rod. It ig then burnished, leaving
a long hard-wearing bearing surface.
To install a piston pin bushing, proceed as
follows:
(1) Install the bushing in the side of the connecting
rod having the large chamfer in the bearing
for the crank pin. Make sure that the oil
hole in the bushing is in line with the oil hole in
the connecting rod and the split is at right angles
to the length of the rod.
(2) Press bushing in rod using bushing replacer,
tool No. HMJ-250-3. Use a 2 or 3-ton bench
arbor press.
(3) Expand the bushing with Expanding Bar
(Tool No. HMJ-250-1). If the bushing protrudes